*{
    margin:0px;
    padding: 0px;
    list-style: none;
    outline: none;
}
.s-left{
    float: left;
}
.s-right{
    float: right;
}
.overhidden{
    overflow: hidden;
}
.center-block{
    margin-left: auto;
    margin-right: auto;

}
.pointer{
    cursor: pointer;
}
.boxsizing{
    box-sizing: border-box;
}